[
  {
    "path": "README.md",
    "content": "A pure Python implementation of [AES](http://en.wikipedia.org/wiki/Advanced_Encryption_Standard)\n\n### TODO\n\n* Add 192 and 256 bit versions\n\n### License\n\n    Copyright (C) 2012 Bo Zhu http://about.bozhu.me\n\n    Permission is hereby granted, free of charge, to any person obtaining a\n    copy of this software and associated documentation files (the \"Software\"),\n    to deal in the Software without restriction, including without limitation\n    the rights to use, copy, modify, merge, publish, distribute, sublicense,\n    and/or sell copies of the Software, and to permit persons to whom the\n    Software is furnished to do so, subject to the following conditions:\n\n    The above copyright notice and this permission notice shall be included in\n    all copies or substantial portions of the Software.\n\n    THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\n    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER\n    DEALINGS IN THE SOFTWARE.\n"
  },
  {
    "path": "aes.py",
    "content": "#!/usr/bin/env python\n\n\n\"\"\"\n    Copyright (C) 2012 Bo Zhu http://about.bozhu.me\n\n    Permission is hereby granted, free of charge, to any person obtaining a\n    copy of this software and associated documentation files (the \"Software\"),\n    to deal in the Software without restriction, including without limitation\n    the rights to use, copy, modify, merge, publish, distribute, sublicense,\n    and/or sell copies of the Software, and to permit persons to whom the\n    Software is furnished to do so, subject to the following conditions:\n\n    The above copyright notice and this permission notice shall be included in\n    all copies or substantial portions of the Software.\n\n    THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\n    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER\n    DEALINGS IN THE SOFTWARE.\n\"\"\"\n\nSbox = (\n    0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,\n    0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,\n    0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,\n    0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,\n    0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,\n    0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,\n    0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,\n    0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,\n    0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,\n    0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,\n    0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,\n    0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,\n    0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,\n    0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,\n    0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,\n    0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16,\n)\n\nInvSbox = (\n    0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB,\n    0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB,\n    0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E,\n    0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25,\n    0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92,\n    0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84,\n    0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06,\n    0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B,\n    0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73,\n    0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E,\n    0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B,\n    0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4,\n    0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F,\n    0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF,\n    0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61,\n    0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D,\n)\n\n\n# learnt from http://cs.ucsb.edu/~koc/cs178/projects/JT/aes.c\nxtime = lambda a: (((a << 1) ^ 0x1B) & 0xFF) if (a & 0x80) else (a << 1)\n\n\nRcon = (\n    0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40,\n    0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,\n    0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,\n    0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39,\n)\n\n\ndef text2matrix(text):\n    matrix = []\n    for i in range(16):\n        byte = (text >> (8 * (15 - i))) & 0xFF\n        if i % 4 == 0:\n            matrix.append([byte])\n        else:\n            matrix[i / 4].append(byte)\n    return matrix\n\n\ndef matrix2text(matrix):\n    text = 0\n    for i in range(4):\n        for j in range(4):\n            text |= (matrix[i][j] << (120 - 8 * (4 * i + j)))\n    return text\n\n\nclass AES:\n    def __init__(self, master_key):\n        self.change_key(master_key)\n\n    def change_key(self, master_key):\n        self.round_keys = text2matrix(master_key)\n        # print self.round_keys\n\n        for i in range(4, 4 * 11):\n            self.round_keys.append([])\n            if i % 4 == 0:\n                byte = self.round_keys[i - 4][0]        \\\n                     ^ Sbox[self.round_keys[i - 1][1]]  \\\n                     ^ Rcon[i / 4]\n                self.round_keys[i].append(byte)\n\n                for j in range(1, 4):\n                    byte = self.round_keys[i - 4][j]    \\\n                         ^ Sbox[self.round_keys[i - 1][(j + 1) % 4]]\n                    self.round_keys[i].append(byte)\n            else:\n                for j in range(4):\n                    byte = self.round_keys[i - 4][j]    \\\n                         ^ self.round_keys[i - 1][j]\n                    self.round_keys[i].append(byte)\n\n        # print self.round_keys\n\n    def encrypt(self, plaintext):\n        self.plain_state = text2matrix(plaintext)\n\n        self.__add_round_key(self.plain_state, self.round_keys[:4])\n\n        for i in range(1, 10):\n            self.__round_encrypt(self.plain_state, self.round_keys[4 * i : 4 * (i + 1)])\n\n        self.__sub_bytes(self.plain_state)\n        self.__shift_rows(self.plain_state)\n        self.__add_round_key(self.plain_state, self.round_keys[40:])\n\n        return matrix2text(self.plain_state)\n\n    def decrypt(self, ciphertext):\n        self.cipher_state = text2matrix(ciphertext)\n\n        self.__add_round_key(self.cipher_state, self.round_keys[40:])\n        self.__inv_shift_rows(self.cipher_state)\n        self.__inv_sub_bytes(self.cipher_state)\n\n        for i in range(9, 0, -1):\n            self.__round_decrypt(self.cipher_state, self.round_keys[4 * i : 4 * (i + 1)])\n\n        self.__add_round_key(self.cipher_state, self.round_keys[:4])\n\n        return matrix2text(self.cipher_state)\n\n    def __add_round_key(self, s, k):\n        for i in range(4):\n            for j in range(4):\n                s[i][j] ^= k[i][j]\n\n\n    def __round_encrypt(self, state_matrix, key_matrix):\n        self.__sub_bytes(state_matrix)\n        self.__shift_rows(state_matrix)\n        self.__mix_columns(state_matrix)\n        self.__add_round_key(state_matrix, key_matrix)\n\n\n    def __round_decrypt(self, state_matrix, key_matrix):\n        self.__add_round_key(state_matrix, key_matrix)\n        self.__inv_mix_columns(state_matrix)\n        self.__inv_shift_rows(state_matrix)\n        self.__inv_sub_bytes(state_matrix)\n\n    def __sub_bytes(self, s):\n        for i in range(4):\n            for j in range(4):\n                s[i][j] = Sbox[s[i][j]]\n\n\n    def __inv_sub_bytes(self, s):\n        for i in range(4):\n            for j in range(4):\n                s[i][j] = InvSbox[s[i][j]]\n\n\n    def __shift_rows(self, s):\n        s[0][1], s[1][1], s[2][1], s[3][1] = s[1][1], s[2][1], s[3][1], s[0][1]\n        s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]\n        s[0][3], s[1][3], s[2][3], s[3][3] = s[3][3], s[0][3], s[1][3], s[2][3]\n\n\n    def __inv_shift_rows(self, s):\n        s[0][1], s[1][1], s[2][1], s[3][1] = s[3][1], s[0][1], s[1][1], s[2][1]\n        s[0][2], s[1][2], s[2][2], s[3][2] = s[2][2], s[3][2], s[0][2], s[1][2]\n        s[0][3], s[1][3], s[2][3], s[3][3] = s[1][3], s[2][3], s[3][3], s[0][3]\n\n    def __mix_single_column(self, a):\n        # please see Sec 4.1.2 in The Design of Rijndael\n        t = a[0] ^ a[1] ^ a[2] ^ a[3]\n        u = a[0]\n        a[0] ^= t ^ xtime(a[0] ^ a[1])\n        a[1] ^= t ^ xtime(a[1] ^ a[2])\n        a[2] ^= t ^ xtime(a[2] ^ a[3])\n        a[3] ^= t ^ xtime(a[3] ^ u)\n\n\n    def __mix_columns(self, s):\n        for i in range(4):\n            self.__mix_single_column(s[i])\n\n\n    def __inv_mix_columns(self, s):\n        # see Sec 4.1.3 in The Design of Rijndael\n        for i in range(4):\n            u = xtime(xtime(s[i][0] ^ s[i][2]))\n            v = xtime(xtime(s[i][1] ^ s[i][3]))\n            s[i][0] ^= u\n            s[i][1] ^= v\n            s[i][2] ^= u\n            s[i][3] ^= v\n\n        self.__mix_columns(s)"
  },
  {
    "path": "test.py",
    "content": "__author__ = 'yousefhamza'\n\nimport unittest\nfrom aes import AES\n\nclass AES_TEST(unittest.TestCase):\n    def setUp(self):\n        master_key = 0x2b7e151628aed2a6abf7158809cf4f3c\n        self.AES = AES(master_key)\n\n    def test_encryption(self):\n        plaintext = 0x3243f6a8885a308d313198a2e0370734\n        encrypted = self.AES.encrypt(plaintext)\n\n        self.assertEqual(encrypted, 0x3925841d02dc09fbdc118597196a0b32)\n\n    def test_decryption(self):\n        ciphertext = 0x3925841d02dc09fbdc118597196a0b32\n        decrypted = self.AES.decrypt(ciphertext)\n\n        self.assertEqual(decrypted, 0x3243f6a8885a308d313198a2e0370734)\n\nif __name__ == '__main__':\n    unittest.main()"
  }
]